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Title: High thermoelectric figure of merit in nanocrystalline polyaniline at low temperatures

Thermoelectric coolers with figure of merit (ZT) close to unity at low temperatures are the need of the hour with new advances in high temperature superconductors, superconducting microelectronic circuits, quantum computers, and photonics. Here, we demonstrate that the conducting polymer polyaniline (Pani) doped with camphor sulfonic acid synthesized in semi-crystalline nanostructures, possesses a giant Seebeck effect at low temperatures. The resulting enormously large Seebeck coefficient (up to 0.6 V/K) combined with an intrinsically low electrical conductivity and thermal conductivity give rise to a ZT = 0.77 at 45 K and ZT = 2.17 at 17 K.
Authors:
;  [1] ;  [2] ;  [3]
  1. Materials Research Laboratory, Department of Physics, Tezpur University, Tezpur 784 028 (India)
  2. Department of Physics, National Dong-Hwa University, Hualien 974, Taiwan (China)
  3. Electrical Transport Laboratory, UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452 017 (India)
Publication Date:
OSTI Identifier:
22350817
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTALS; DOPED MATERIALS; ELECTRIC CONDUCTIVITY; HIGH-TC SUPERCONDUCTORS; MICROELECTRONIC CIRCUITS; NANOMATERIALS; NANOSTRUCTURES; POLYMERS; QUANTUM COMPUTERS; SEEBECK EFFECT; TEMPERATURE RANGE 0013-0065 K; THERMAL CONDUCTIVITY; THERMOELECTRIC COOLERS; THERMOELECTRIC PROPERTIES